SHINE超导波荡器磁场点测量霍尔探头位置标定  

Positional calibration of Hall probes for magnetic field measurement of a superconducting undulator in SHINE

作　　者：吴泽州 张继东 陈金雅 周巧根[1,3] WU Zezhou;ZHANG Jidong;CHEN Jinya;ZHOU Qiaogen(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院大学,北京100049 [3]中国科学院上海高等研究院,上海201204

出　　处：《核技术》2023年第9期9-16,共8页Nuclear Techniques

基　　金：上海市市级科技重大专项(No.2017SHZDZX02)资助。

摘　　要：正在建设的上海硬X射线自由电子激光装置(Shanghai HIgh repetitioN rate XFEL and Extreme light facility,SHINE)将利用40台周期长度为16 mm、磁长度为4 m、净气隙高度为4 mm的真空内超导波荡器,以产生垂直线极化的自由电子激光。霍尔探头磁场测量是目前测量波荡器场图最可靠的测量方法之一,而霍尔探头灵敏中心的定位精度是影响磁场测量精度的主要因素之一。本文介绍了这些超导波荡器的磁场点测量系统,以及霍尔探头灵敏中心的高精度位置标定。通过翻转安装有霍尔探头与角锥棱镜的磁测滑车,可分别标定霍尔探头灵敏中心以及角锥棱镜顶点和磁测滑车翻转轴的横向间距,从而获得霍尔探头灵敏中心彼此之间的横向距离,以及霍尔探头灵敏中心与角锥棱镜顶点之间的横向距离。该方法的标定精度好于±10μm,能满足该超导波荡器磁场测量的要求。[Background]In the Shanghai High Repetition rate XFEL(X-ray free electron laser)and Extreme Light(SHINE)facility,the vertical linear polarization laser is generated by using 40 planar superconducting undulators(SCUs)with a period length of 16 mm,length of 4 m,and a gap of 4 mm.At present,the Hall probes are the most reliable method for measuring the undulator magnetic field whilst the positioning accuracy of the sensitive center of the Hall probe is one of the main factors affecting the accuracy of magnetic field measurement.[Purpose]This study aims to calibrate the position of the Hall probes'sensitive region for magnetic field measurements of SCU with high-precision.[Methods]The experimental platform for magnetic field point measurement of SCUs was introduced in details,a sledge with three mounted Hall probes and a retro-reflector were applied for magnetic field measurement.By flipping the sledge,the lateral distance between the sensitive centers of the Hall probe and each other were obtained,so did the lateral distance between the sensitive centers of the Hall probe and the apex of the pyramid prism.Therefore,the position of the Hall probes'sensitive region and center of the retro-reflector were calibrated.[Results&Conclusions]The positional calibration of the Hall probes has an accuracy higher than±10μm,which meets the requirements for magnetic field measurement.

关 键 词：超导波荡器 磁场点测量 三维激光定位 

分 类 号：TL655[核科学技术—核技术及应用]